2218365 has 12 divisors (see below), whose sum is σ = 3845244. Its totient is φ = 1183104.

The previous prime is 2218361. The next prime is 2218367. The reversal of 2218365 is 5638122.

It can be written as a sum of positive squares in 2 ways, for example, as 338724 + 1879641 = 582^2 + 1371^2 .

It is not a de Polignac number, because 2218365 - 2² = 2218361 is a prime.

It is a super-3 number, since 3×2218365³ = 32750675991923331375, which contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2218361) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 24604 + ... + 24693.

It is an arithmetic number, because the mean of its divisors is an integer number (320437).

2^2218365 is an apocalyptic number.

It is an amenable number.

2218365 is a deficient number, since it is larger than the sum of its proper divisors (1626879).

2218365 is a wasteful number, since it uses less digits than its factorization.

2218365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49308 (or 49305 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 2218365 is about 1489.4176714408. The cubic root of 2218365 is about 130.4200417399.

It can be divided in two parts, 221836 and 5, that added together give a square (221841 = 471²).

The spelling of 2218365 in words is "two million, two hundred eighteen thousand, three hundred sixty-five".